Direct-current converter with current limiting

H - Electricity – 02 – M

Patent

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Details

H02M 3/335 (2006.01)

Patent

CA 2081335

Direct-current converter having an electronic switch which can be made conductive by switch-on pulses and having current limiting by suppression of switch-on pulses. In order to make do with a low-loss current sensor which is easy to realize, a direct voltage corresponding to the peak value of the current is obtained with the aid of an additional switch, in phase with the electronic switch, which is preferably a reverse-operated field-effect transistor. The converter is particularly suitable for applications in which low-impedance short circuits at the output of the converter have to be taken into account.

Convertisseur à courant continu muni d'un interrupteur électronique pouvant devenir conducteur sous l'action d'impulsions de mise en circuit et pouvant limiter le courant par la suppression de ces impulsions de mise en circuit. Pour que l'on puisse utiliser un détecteur de courant à faibles pertes de réalisation facile, on crée une tension continue correspondant à une valeur de crête du courant en faisant appel à un interrupteur supplémentaire, en phase avec l'interrupteur électronique, lequel est de préférence un transistor à effet de champ à fonctionnement inverse. Ce convertisseur est spécialement adapté aux applications pour lesquelles il est nécessaire de tenir compte des courts-circuits à faible impédance à la sortie du convertisseur.

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